(Moving to www-style.)
So, the 2013-03-19 css3-values ED has:
1. Normative text saying that viewport units are based on the initial
containing block
2. A note saying how Paged Media defines the ICB to be based only on the
first page.
IÃ­ve been bringing up repeatedly the issue of viewport units vs. @page
rules, but itÃ­s even more tricky than I initially though. At this point
I think that 2. will not end up being accurate. IÃ­m not even sure about
1., since the term "ICB" is so overloaded in Paged Media (we might need
multiple terms defined differently.)
WeÃ­ll need more time to solve this issue, but I donÃ­t want css3-values
to be blocked on that. Still, I donÃ­t want css3-values to be published
with statements that will turn out incorrect but hard to change.
Suggested change: css3-values defines viewport units to be based on a
rectangle that is the ICB in continuous media, but undefined by
css3-value in paged media. (css3-page is expected to define it.)
(Any media is either continuous or paged, right?)
In particular, remove any mention of the first page.
--
Simon Sapin